Purpose <p>The double-flap technique (DFT) is an anti-reflux reconstruction procedure performed after proximal gastrectomy (PG), but its complexity and high incidence of anastomotic stenosis are problematic. We conducted this study to demonstrate the efficacy of robot-assisted DFT, with refinements, to address these issues.</p> Methods <p>Surgical outcomes were compared between the following procedures modified over time at our institution: conventional open DFT (group O, <i>n</i> = 16); early robotic DFT (group RE, <i>n</i> = 19), which follows the conventional open PG approach; and late robotic DFT (group RL, <i>n</i> = 21), which incorporates refinements to the early robotic DFT technique by exploiting more of the robotic capabilities available. These robotic capabilities include pre-anchoring the stomach to the diaphragmatic crus and connecting it to the esophagus, placing interrupted sutures for anastomosis, and maximally embedding the esophagus through the entire flap.</p> Results <p>Anastomotic stenosis requiring balloon dilatation developed in two (11.8%) patients from group O and three (14.3%) from group RE, but not in any patients from group RL. Reflux esophagitis, classified as Los Angeles Classification grade ≥ B, decreased from 25.0% in group O to 10.5% in group RE and was completely controlled in group RL (group RL vs group O, odds ratio 0.065, 95% confidence interval &lt; 0.001–0.684, <i>P</i> = 0.007).</p> Conclusion <p>Robotic surgery helps minimize anastomotic stenosis, while enhancing the benefits of anti-reflux reconstruction with DFT.</p>